4,371 institutions reported holding $323.33B of COSTCO WHOLESALE CORPORATION (COST) in SEC 13F filings for 2026-06-30. Largest institutional holders: VANGUARD GROUP INC ($41.12B), BlackRock, Inc. ($32.00B), STATE STREET CORP ($17.20B), Invesco Ltd. ($13.09B), GEODE CAPITAL MANAGEMENT, LLC ($9.90B). Source: SEC Form 13F.
Source: SEC Form 13F filings · as of 2026-06-30